SNOSB31J July 2009 – December 2014 LMX2541
The LMX2541 device is an ultra low-noise frequency synthesizer which integrates a high-performance delta-sigma fractional N PLL, a VCO with fully integrated tank circuit, and an optional frequency divider. The PLL offers an unprecedented normalized noise floor of –225 dBc/Hz and can be operated with up to 104 MHz of phase-detector rate (comparison frequency) in both integer and fractional modes. The PLL can also be configured to work with an external VCO.
The LMX2541 integrates several low-noise, high-precision LDOs and output driver matching network to provide higher supply noise immunity and more consistent performance, while reducing the number of external components. When combined with a high-quality reference oscillator, the LMX2541 generates a very stable, ultra low-noise signal.
The LMX2541 is offered in a family of 6 devices with varying VCO frequency range from 1990 MHz up to 4 GHz. Using a flexible divider, the LMX2541 can generate frequencies as low as 31.6 MHz.
The LMX2541 is a monolithic integrated circuit, fabricated in a proprietary BiCMOS process. Device programming is facilitated using a three-wire MICROWIRE interface that can operate down to 1.6 volts. Supply voltage ranges from 3.15 V to 3.45 V. The LMX2541 is available in a 36-pin 6-mm × 6-mm × 0.8-mm WQFN package.
|PART NUMBER||PACKAGE||VCO FREQUENCY (MHz)|
|LMX2541SQ2060E||WQFN (36)||1990 - 2240|
|LMX2541SQ2380E||WQFN (36)||2200 - 2530|
|LMX2541SQ2690E||WQFN (36)||2490 - 2865|
|LMX2541SQ3030E||WQFN (36)||2810 - 3230|
|LMX2541SQ3320E||WQFN (36)||3130 - 3600|
|LMX2541SQ3740E||WQFN (36)||3480 - 4000|